A couple weeks ago, I lead a trad route that topped out at two closely spaced anchors. I usually climb with the trango alpine equilizer, but I have the 6-foot version which really only works well with anchor points that are decently spread out. For this case, I had to collapse the inner loop and fix the outer loops into short clove hitches to setup a good anchor to belay a follower.
It worked, but looked like a black-widow web with all the excess length from the equilizer just hanging there. When I got home I reopened my 'Rock Climbing Anchors: A Comprehensive Guide' (Leubben) to see what I've forgotten...and lo and behold I found the double loop bowline (also the double loop figure 8, but the book states the bowline is 'more redundant' assuming you cinch everything down properly).
So I'm wondering if you can belay off of this knot in an autoblock-mode? I would think you could by clipping through the three 'layers' of rope at the bottom of the knot as a master-point (with the shelf being clipping through the top two loops running to the anchor). I don't really trust my at-home tests with some coord and me pulling on the rope.
Asking around at the gym, most people have 'heard' of this knot, but no one that's really used it. Don't know if that counts as strike 1 against this method, but hey...it's in a book right?
Anyone use this? Am I right/wrong in assuming I can autoblock off of it, assuming that the next pitch isn't a rope-stretcher?